Responsive Four Feature Sections

What are you most proud of, and what would you do differently next time?

It was the first time that I tried to guess how long it would take to create this responsive page and I was really close to the timer I have set. The challenge was easier than the last one I did as I already knew few things about responsive.

What challenges did you encounter, and how did you overcome them?

I didn't faced any real challenge for this one. I might not be perfectly similar with the design given but i'm close enough to be proud of me.

What specific areas of your project would you like help with?

When would you put breakpoint(s) for this kind of page ? I didn't want to spend more time on it but I think that i could do 3 differents medias for this project. What do you think of it ?

Also, any other feedback would be appreciated :)